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Patented Oct 16 1883 h ,l1/f

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' E. SCHMIDT. TURNING CHAIR.

No. 286,641. Patented Got'. 16, 1883.

i UNITED STATES PATENT Erice EDWIN seHMIDT, or LEIrsIo, sAXoNY, GERMANY.

'TURNlNG CHAIR.

SPECIFICATION forming part of Letters Patent No. 286,641, dated ctober16, 1883.

l Application led November 25, 18H2. (No model.)

To LEZ whom it may concern:

ABe it known that I, ERWIN SCHMIDT, a citizen of Germany, residing atLeipsic, in the German Empire, have invented anew anduscful Improvementin Turning Chairs, of which the following is a specification.

In the accompanying drawings, Figure l represents a vertical section ofa vturning chair embodying my invention. Fig. 2 is a hori-` zontalsection at line AlFig. l. Fig. 4is an outside View of the chair. Fig. 5is asection at line C D, Fig. 4; and Fig. 3 shows a modiiication of thescrewr mechanisms, being an equivalent. V

Similar letters represent similar parts in all Y the figures.

To the seat S of the chair a disk, G, is attached by means of suitabledistancepiec'es, ava. The legs f of the chair are provided near theirupper ends with toothed segments Z, and the circumference of the disk Ghas a regular thread cut in, meshing into the teeth of the segments Z,which latter form segments of a regular nut if the same were continuedall around. This arrangement supports the thread on the disk G at threeor more places, according to the number of legs made on thechair,

and gives great stability to the same and to the seat, being nearly atthe outer circumference of the seat.

Instead of the regular screw-thread out on the disk G and Working intothe toothed segments Z Z Z, attached to the legs as above described,abar, 7L, Wou nd spiral, si miler to a spiral spring, may be attached tothe legs f, (see Fig. 3,) and the disk G, provided on its periphery withprojecting teeth g g, which, if continued, would forni a screw, andwhich rest upon the bar la at three or more places in the circumference.

What I claim as my invention, and desireto secure by Letters Patent, is-

In a revolving chair, the disk G, supporting the seat S, and providedwith a screwthread on its circumference, in combination with the toothedsegments Z, attached to the chair-legs f, and forming a bearing for thedisk, substantially in the manner and for the purpose described.

ERWIN SCHMIDT.

W'itnesses:

ALBERT RUDOLPH, EMIL RUDOLPH.

